Similar here. My DND runs automatically between 10pm and 7am, but I have a small number of people whitelisted whose calls will come through. Mine also has a setting where it will let someone through if they call twice within fifteen minutes. I don't think anyone's ever actually phoned during that time block but it gives me peace of mind to know I can still be reached in an emergency.

Also because it's nice to live somewhere clean and tidy?